HUMPHREYS , K. (1991). JELENS COST AND OPTIMIZATION ENGINEERING. MCGRAW HILL.
Cita Chicago (17th ed.)HUMPHREYS , K.K. JELENS COST AND OPTIMIZATION ENGINEERING. NEW-YORK: MCGRAW HILL, 1991.
Cita MLA (9th ed.)HUMPHREYS , K.K. JELENS COST AND OPTIMIZATION ENGINEERING. MCGRAW HILL, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.